I hope I'll have enought time next week to make correspondent benchmark by myself. I'll compare (Spring MVC + JSP) with JSF performance on basic operations. I'll post my results in this thread as soon as I can.
–
RomanFeb 26 '10 at 19:42

1 Answer
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Sun JSF RI 1.0 and 1.1 were indeed performance hogs and it indeed became negatively in the news. However, since JSF RI 1.2 (Mojarra) around early 2006, which was maintained by a new, young and excellent dev team, a lot of performance related enhancements and fixes were done. Also, computers became faster in years. The differences as opposed to "plain JSP" and other frameworks are nowadays very minimal. JSF still needs to get rid of her old "hogging slow" imago.

If one still encounters performance problems nowadays, then it's often just caused by bad code, regardless of the framework used, or ignorance of how HTTP works under the hoods in the complete picture (a lot can already be enhanced with a few simple things).